Underwater filmmakers Howard and Michele Hall have spent 25 years diving and documenting the most remote and beautiful underwater locations, always learning something new about the fantastic creatures that live there. Yet even these remote places and creatures are at risk in today's world, and being able to share their experiences with the rest of us is increasingly important to the Halls, and to us. They take us along on the dive of a lifetime, to a tiny outpost 300 miles off the coast of Central American - Shark Mountain.